1 /*
2 * Copyright (c) 2021 Microchip Inc.
3 *
4 * SPDX-License-Identifier: Apache-2.0
5 */
6
7 #define DT_DRV_COMPAT microchip_xec_bbram
8
9 #include <zephyr/drivers/bbram.h>
10 #include <errno.h>
11 #include <soc.h>
12 #include <zephyr/sys/util.h>
13
14 #include <zephyr/logging/log.h>
15 LOG_MODULE_REGISTER(bbram, CONFIG_BBRAM_LOG_LEVEL);
16
17 /** Device config */
18 struct bbram_xec_config {
19 /** BBRAM base address */
20 uint8_t *base;
21 /** BBRAM size (Unit:bytes) */
22 int size;
23 };
24
bbram_xec_check_invalid(const struct device * dev)25 static int bbram_xec_check_invalid(const struct device *dev)
26 {
27 struct vbatr_regs *const regs = (struct vbatr_regs *)(DT_REG_ADDR_BY_NAME(
28 DT_NODELABEL(pcr), vbatr));
29
30 if (regs->PFRS & BIT(MCHP_VBATR_PFRS_VBAT_RST_POS)) {
31 regs->PFRS |= BIT(MCHP_VBATR_PFRS_VBAT_RST_POS);
32 LOG_ERR("VBAT power rail failure");
33 return -EFAULT;
34 }
35
36 return 0;
37 }
38
bbram_xec_get_size(const struct device * dev,size_t * size)39 static int bbram_xec_get_size(const struct device *dev, size_t *size)
40 {
41 const struct bbram_xec_config *dcfg = dev->config;
42
43 *size = dcfg->size;
44 return 0;
45 }
46
bbram_xec_read(const struct device * dev,size_t offset,size_t size,uint8_t * data)47 static int bbram_xec_read(const struct device *dev, size_t offset, size_t size,
48 uint8_t *data)
49 {
50 const struct bbram_xec_config *dcfg = dev->config;
51
52 if (size < 1 || offset + size > dcfg->size) {
53 LOG_ERR("Invalid params");
54 return -EFAULT;
55 }
56
57 bytecpy(data, dcfg->base + offset, size);
58 return 0;
59 }
60
bbram_xec_write(const struct device * dev,size_t offset,size_t size,const uint8_t * data)61 static int bbram_xec_write(const struct device *dev, size_t offset, size_t size,
62 const uint8_t *data)
63 {
64 const struct bbram_xec_config *dcfg = dev->config;
65
66 if (size < 1 || offset + size > dcfg->size) {
67 LOG_ERR("Invalid params");
68 return -EFAULT;
69 }
70
71 bytecpy(dcfg->base + offset, data, size);
72 return 0;
73 }
74
75 static const struct bbram_driver_api bbram_xec_driver_api = {
76 .check_invalid = bbram_xec_check_invalid,
77 .get_size = bbram_xec_get_size,
78 .read = bbram_xec_read,
79 .write = bbram_xec_write,
80 };
81
82 #define BBRAM_INIT(inst) \
83 static const struct bbram_xec_config bbram_cfg_##inst = { \
84 .base = (uint8_t *)(DT_INST_REG_ADDR(inst)), \
85 .size = DT_INST_REG_SIZE(inst), \
86 }; \
87 DEVICE_DT_INST_DEFINE(inst, NULL, NULL, NULL, &bbram_cfg_##inst,\
88 PRE_KERNEL_1, CONFIG_BBRAM_INIT_PRIORITY, \
89 &bbram_xec_driver_api);
90
91 DT_INST_FOREACH_STATUS_OKAY(BBRAM_INIT);
92
